#include"Nguoi.h"
#include"NguoiAnh.h"
#include "NguoiViet.h"
#include <conio.h>
int main()
{
	Nguoi *n;
	NguoiViet nv;
	NguoiAnh na;
	n=&nv;
	n->Chao();
	n=&na;
	n->Chao();
	_getch();
	return 0;
}